docs: def _should_allocate_port(pid):
      """Determine if we should allocate a port for use by the given process id."""
      if pid <= 0:
          log.info('Not allocating a port to invalid pid')
          return False
      if pid == 1:
          # The client probably meant to send us its parent pid but
          # had been reparented to init.
          log.info('Not allocating a port to init.')
          return False
      try:
          os.kill(pid, 0)
      except ProcessLookupError:
          log.info('Not allocating a port to a non-existent process')
          return False
      return True